More HP from Jasper motor
Thread Starter
Racer
Joined: Mar 2008
Posts: 487
Likes: 48
From: Ocala Florida
More HP from Jasper motor
I have a '76 C3 I just purchased and it came with a new Jasper motor. Upon contacting Jasper they not only acknowledged the engine but sent me the specs on it as well. I has 300 hp from them and at present has a total of about 2,400 miles on it. It has the stock intake on it as well. My question is , what would be the best and easiest way to pick up an additional 75 hp or so? Bigger cam and new intake? I have headers on it already but would like more HP without boring or changing heads.
Thanks
Thanks
Thread Starter
Racer
Joined: Mar 2008
Posts: 487
Likes: 48
From: Ocala Florida
Here are all the specs from the sheet they emailed me:
Displacement: 355 - 358 cubic inches
HP 300 @ 5000 rpm
Vacuum 12-14 HG
Torque 363 ft. lbs @ 3900 rpm
Max Recommended RPM 5500
Compression Ratio 9:1
Piston Material Hypereutectic
Connecting rods Stock Remanufactured
Cylinder Heads New Aftermarket heads w/76cc chambers
Valve Train Overhead valve w/push rod
Camshaft Hydraulic Flat Tapped design
Intake Valve Diameter 1.94"
Exhaust Valve Diameter 1.50"
Advertised Lift (Intake/Exhaust) .443/.465
Advertised Duration (Intake/Exhaust) .280/.290
Rocker Arm Ratio 1.50"
Valve Lash Zero
Engine Idle Speed 650 rpm
Spark plugs R44TS Rec
Spark Plug Gap .046
Fuel Pressure Required 5 to 8 psi Rec.
Hope this helps. Let me know if you need anything further.
Displacement: 355 - 358 cubic inches
HP 300 @ 5000 rpm
Vacuum 12-14 HG
Torque 363 ft. lbs @ 3900 rpm
Max Recommended RPM 5500
Compression Ratio 9:1
Piston Material Hypereutectic
Connecting rods Stock Remanufactured
Cylinder Heads New Aftermarket heads w/76cc chambers
Valve Train Overhead valve w/push rod
Camshaft Hydraulic Flat Tapped design
Intake Valve Diameter 1.94"
Exhaust Valve Diameter 1.50"
Advertised Lift (Intake/Exhaust) .443/.465
Advertised Duration (Intake/Exhaust) .280/.290
Rocker Arm Ratio 1.50"
Valve Lash Zero
Engine Idle Speed 650 rpm
Spark plugs R44TS Rec
Spark Plug Gap .046
Fuel Pressure Required 5 to 8 psi Rec.
Hope this helps. Let me know if you need anything further.
Thread Starter
Racer
Joined: Mar 2008
Posts: 487
Likes: 48
From: Ocala Florida
My pockets are bottomless but I am willing to spend the money necessary. I really don't want to do a complete tear-down in order to make it happen.
As for the warranty, that's something I'm still checking on. I am waiting to hear back from Jasper on it. Would make the situation a little different but don't know that it would prevent me from moving forward.
The last project I did before this C3 was a Camaro with 430 hp so I would like for the Vette to be a little more powerful than the present 300.
As for the warranty, that's something I'm still checking on. I am waiting to hear back from Jasper on it. Would make the situation a little different but don't know that it would prevent me from moving forward.
The last project I did before this C3 was a Camaro with 430 hp so I would like for the Vette to be a little more powerful than the present 300.
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
Need to know the manufacturer. They have 1.94 1.50 valves and 76cc chambers so likely a stock replacement head. Heads are where power capability comes from. You will not add 75 useable HP to the 300 you have without a head upgrade. Your cam is fairly stout for a 9 to 1 engine. The heads are your bottleneck. You could likely get your 75 HP with a head swap to 65 CC AFR 180 Eliminators. An intake swap will help also but would be very minor with no head swap.
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Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
I would guess it is a Lunati Bare Bones http://www.lunatipower.com/Product.aspx?id=2505
This cam will perform better with more compression. Good match for higher compression you will get with the smaller 65 CC chambers on the AFR heads. I would use it and go with 1.6 rockers for more lift and new pushrods for the longer valves. A Roller will get you a little more power and piece of mind.
This cam will perform better with more compression. Good match for higher compression you will get with the smaller 65 CC chambers on the AFR heads. I would use it and go with 1.6 rockers for more lift and new pushrods for the longer valves. A Roller will get you a little more power and piece of mind.
Le Mans Master
Joined: Mar 2008
Posts: 5,948
Likes: 72
From: Oxford MA-----You just lost the game!!!!
That's the same cam that comes with this Summit racing top-end combo. It's advertised as putting out 355 horsepower. The heads that 63 mako suggests are a bit better than the heads that come with the Summit combo, so, yeah, sure, probably 375 or close to it.
http://www.summitracing.com/parts/sm...-400/overview/
Scott
http://www.summitracing.com/parts/sm...-400/overview/
Scott
Le Mans Master
Joined: May 2007
Posts: 5,031
Likes: 1,121
From: North tonawanda NY
http://www.usaperform.com/street-fig...ift-p-489.html summit, crane , lunati and elgin all have this cam.... some are on different lsa and lunati rates their advertised duration differently.... there are like three major camshaft manufacturers I believe who produce almost all of the popular brands.....I remember reading an article about it.... I even posted links to it a couple weeks ago in my cam thread....(elgin had the best deal by far with the whole kit including valve seals and springs/keepers for $150.
Its a fairly good cam.. I was considering it before going with the voodoo 262 but dyno2000 gave me HP and torque numbers around 375/400# with your cam and my 64cc iron eagle heads. A bit optimistic I think but more software dyno programs are.
Its a fairly good cam.. I was considering it before going with the voodoo 262 but dyno2000 gave me HP and torque numbers around 375/400# with your cam and my 64cc iron eagle heads. A bit optimistic I think but more software dyno programs are.