383 suggestions-dyno
Team Owner
Joined: Oct 2004
Posts: 81,241
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From: altered state
St. Jude Donor '05
If you want a quality American made head get the AFR
Got some good gains on my 383 fully porting the Team G a 1 in spacer helped out too;if you dont have such a great head probably less gains to be had
However if you arent taking it up over say 6kget a good dual plane and enjoy.
Got some good gains on my 383 fully porting the Team G a 1 in spacer helped out too;if you dont have such a great head probably less gains to be had
However if you arent taking it up over say 6kget a good dual plane and enjoy.
Safety Car
Joined: Oct 2004
Posts: 3,926
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From: Youngstown Ohio
Interesting Article - High Stall Cars Dyno Torque Readings
What I've found out to be true....
http://converter.com/article2.htm
http://converter.com/article2.htm
Thread Starter
Cruising
Joined: Aug 2014
Posts: 14
Likes: 0
The guy I bought the motor from does not recall what heads were used, but he said he only spent around $700 on the aluminum heads, so my guess is bottom line heads, anybody using the profiler- jegs heads they flow almost as good as the AFR
Race Director
Joined: Apr 2000
Posts: 17,676
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From: Who says "Nothing is impossible" ? I've been doing nothing for years.
To the OP, those numbers are pretty damn good, almost too good to be true with a small cam, low lift and heads that don't flow a great deal. I would put 1.6 rockers on it that way you can at least least get to max CFM near .500"
Race Director
Joined: May 2005
Posts: 10,674
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From: Millington Illinois
St. Jude Donor '08-'09
I would say more like 450hp at crank, minus 20 percent loss equals 375 rwhp, I have spent a lot of $ on this car and i have couple more thousand to complete engine work, just want the best bang for buck with increasing hp and performance, afr heads are $1500 alone, what about profiler-jegs heads, they flow almost as good as the afr and I could increase to 1.6 rockers for the same price as the afr heads, augiedoogy I don't have the clearance under my hood for high rise dual plane,
30%-35% or more minimum. There is no way the 375 RWHP is correct with that cam and heads with 1 5/8 headers.
1971 corvette gross HP 270 (No accessories, open headers, tuned)
1972 corvette net HP 200 (Accessories, Stock timing and exhaust)
Same engine. Both rated on a test stand at the flywheel. (over 25% loss right there)
Add parasitic loss from auto trans
plus ujoints
rear gears
halfshaft ujoints
Bearings
Power steering pump (not figured in net)
That translates to about 500 RWHP. Very optimistic Dyno.
AFR 195 heads with 8019 springs and this cam and 1.6 rockers http://www.compcams.com/Company/CC/c...?csid=152&sb=2
Will get you a bunch more power across the board with identical drive characteristics and powerband.
AFR 195 heads with 8019 springs and this cam and 1.6 rockers http://www.compcams.com/Company/CC/c...?csid=152&sb=2
Will get you a bunch more power across the board with identical drive characteristics and powerband.
Last edited by 63mako; Aug 7, 2014 at 11:04 PM.
Le Mans Master
Joined: May 2007
Posts: 5,028
Likes: 1,120
From: North tonawanda NY
They may have gotten bought out. Or maybe the were trying to shake the bad reviews from the early heads... I agree they are far from the best but they really aren't bad for the money... certainly better than stock. There are a couple others here that admitted to running them and likely a few more that are keeping quiet.
The brand name doesn't mean much to be these days.. a lot of it is a marketing game. Like Dunlop tire... Goodyear bought them out years ago. yet they operate them like a separate company as far as the average consumer knows.
Last edited by augiedoggy; Aug 8, 2014 at 10:08 AM.
Burning Brakes
Joined: Dec 2003
Posts: 1,004
Likes: 7
From: Adelaide South Australia
You should be absolutely ecstatic with those rear wheel chassis dyno numbers for that build.
If you're not happy with the performance I would be inclined to think the numbers must be exagerated.
373 rwhp should get you mid 11's with a good launch on slicks.
You should easily pull lo to mid 12's on street tyres.
What level of performance are you wanting to achieve?
If you're not happy with the performance I would be inclined to think the numbers must be exagerated.
373 rwhp should get you mid 11's with a good launch on slicks.
You should easily pull lo to mid 12's on street tyres.
What level of performance are you wanting to achieve?
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Le Mans Master
Joined: Oct 2007
Posts: 7,453
Likes: 976
From: RI, Now Franklin/Nashville TN
Automatic plus engine accessories is way more than 20%.
30%-35% or more minimum. There is no way the 375 RWHP is correct with that cam and heads with 1 5/8 headers.
1971 corvette gross HP 270 (No accessories, open headers, tuned)
1972 corvette net HP 200 (Accessories, Stock timing and exhaust)
Same engine. Both rated on a test stand at the flywheel. (over 25% loss right there)
Add parasitic loss from auto trans
plus ujoints
rear gears
halfshaft ujoints
Bearings
Power steering pump (not figured in net)
30%-35% or more minimum. There is no way the 375 RWHP is correct with that cam and heads with 1 5/8 headers.
1971 corvette gross HP 270 (No accessories, open headers, tuned)
1972 corvette net HP 200 (Accessories, Stock timing and exhaust)
Same engine. Both rated on a test stand at the flywheel. (over 25% loss right there)
Add parasitic loss from auto trans
plus ujoints
rear gears
halfshaft ujoints
Bearings
Power steering pump (not figured in net)
No way 375 RWHP with those heads and cam-no way! You would need 535 Gross HP out of that 383 to hit 375 RWHP and I just don't see how that is possible with a moderate flat tappet cam and average heads. Even with 195 AFR's and a roller cam of 550/560 lift with 11:1 compression, I doubt it.
Last edited by jb78L-82; Aug 8, 2014 at 08:13 PM.
Race Director
Joined: May 2003
Posts: 10,956
Likes: 409
From: California
Quote:
Originally Posted by 63mako View Post
Automatic plus engine accessories is way more than 20%.
30%-35% or more minimum. There is no way the 375 RWHP is correct with that cam and heads with 1 5/8 headers.
1971 corvette gross HP 270 (No accessories, open headers, tuned)
1972 corvette net HP 200 (Accessories, Stock timing and exhaust)
Same engine. Both rated on a test stand at the flywheel. (over 25% loss right there)
Add parasitic loss from auto trans
plus ujoints
rear gears
halfshaft ujoints
Bearings
Power steering pump (not figured in net)
No way 375 RWHP with those heads and cam-no way! You would need 535 Gross HP out of that 383 to hit 375 RWHP and I just don't see how that is possible with a moderate flat tappet cam and average heads. Even with 195 AFR's and a roller cam of 550/560 lift with 11:1 compression, I doubt it.
Thread Starter
Cruising
Joined: Aug 2014
Posts: 14
Likes: 0
Ok so I found out some more info on my motor because I started to second quess the dyno. Here we go comp cam XE274h, so 230/236, at.500, and Dart shp 200cc heads with 10.4 to 1 compresision, headman headers with pypes exhuast with pypes violator mufflers, I am happy with the car, it's fast and can burn rubber into second gear, just need to get over 400rwhp
Going to put on the afr 195 eliminators next week with 1.6 rockers then back on the dyno she will go
Going to put on the afr 195 eliminators next week with 1.6 rockers then back on the dyno she will go
Last edited by Floatplanepilotguy; Aug 9, 2014 at 10:16 PM.
Safety Car
Joined: Jan 2009
Posts: 3,736
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From: anchorage ak
Quote:
Originally Posted by 63mako View Post
Automatic plus engine accessories is way more than 20%.
30%-35% or more minimum. There is no way the 375 RWHP is correct with that cam and heads with 1 5/8 headers.
1971 corvette gross HP 270 (No accessories, open headers, tuned)
1972 corvette net HP 200 (Accessories, Stock timing and exhaust)
Same engine. Both rated on a test stand at the flywheel. (over 25% loss right there)
Add parasitic loss from auto trans
plus ujoints
rear gears
halfshaft ujoints
Bearings
Power steering pump (not figured in net)
wasn't going to say it... but yea :agree: .... it would be interesting to see the actual Dyno sheet...
Thread Starter
Cruising
Joined: Aug 2014
Posts: 14
Likes: 0
Maybe bigger cam and AFR, plenty of dyno numbers out their with comp cam 294s and AFR making 540hp at the crank, would put 400hp at the wheels, bigger motor no way, 383 can put 400hp at the wheels
Last edited by Floatplanepilotguy; Aug 10, 2014 at 09:31 AM.
Race Director
Joined: May 2003
Posts: 10,956
Likes: 409
From: California
Waiting to see dyno sheet.....
Yes it is possable.... But not with those heads, not with a flat tappit cam, not with that cam, not with that compression ratio, not with thoes headers... Not without custom porting.... No.... Not possable with that engine... And not easy to do even with with a ton of $$$
A 500 hp 383 wil cost ~$7-10k+.... And will peak around 6-7krpm...
AND.... If you do achive the 500hp, you will snap your cast crank.... Ask me how I know this...500+hp will need a forged crank
A 500 hp 383 wil cost ~$7-10k+.... And will peak around 6-7krpm...
AND.... If you do achive the 500hp, you will snap your cast crank.... Ask me how I know this...500+hp will need a forged crank
Last edited by pauldana; Aug 10, 2014 at 02:37 PM.
Race Director
Joined: Apr 2000
Posts: 17,676
Likes: 201
From: Who says "Nothing is impossible" ? I've been doing nothing for years.
400RWHP is going to be hard to achieve with a flat tappet cam. Ask for SAE corrected printout so there's real numbers to compare. 400RWHP is going to need at least 6500RPM.
I wish you good luck with your what you are doing
Safety Car
Joined: Jan 2009
Posts: 3,736
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From: anchorage ak
Its completely possibke to hit 540 horse out of a 383" just aint that easy or cheap. Take it out to the strip or a road course or an auto x, let those be your dyno, they may not tell you the exact number your making but they do tell you the exact number your making use of.
Last edited by bluedawg; Aug 10, 2014 at 12:47 PM.
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
x2
A 500hp 383 is a cakewalk these days if youre resourceful, dont get caught up in bling/ trendy stuff it can be done reasonably. On the flip side cheaping out on parts can make a cheap motor very expensive too
As the hp creeps up from say the 500 mark so does the rpm; can becomes expensive very fast and longevity (usually valvetrain parts) takes a nosedive.
A 500hp 383 is a cakewalk these days if youre resourceful, dont get caught up in bling/ trendy stuff it can be done reasonably. On the flip side cheaping out on parts can make a cheap motor very expensive too
As the hp creeps up from say the 500 mark so does the rpm; can becomes expensive very fast and longevity (usually valvetrain parts) takes a nosedive.
Last edited by cv67; Aug 10, 2014 at 12:51 PM.
Safety Car
Joined: Jan 2009
Posts: 3,736
Likes: 56
From: anchorage ak
x2
A 500hp 383 is a cakewalk these days if youre resourceful, dont get caught up in bling/ trendy stuff it can be done reasonably. On the flip side cheaping out on parts can make a cheap motor very expensive too
As the hp creeps up from say the 500 mark so does the rpm; can becomes expensive very fast and longevity (usually valvetrain parts) takes a nosedive.
A 500hp 383 is a cakewalk these days if youre resourceful, dont get caught up in bling/ trendy stuff it can be done reasonably. On the flip side cheaping out on parts can make a cheap motor very expensive too
As the hp creeps up from say the 500 mark so does the rpm; can becomes expensive very fast and longevity (usually valvetrain parts) takes a nosedive.