Opinion on heads
Thread Starter
Safety Car
Joined: Oct 2005
Posts: 3,570
Likes: 1
From: Algonac Michigan
Opinion on heads
I bought a 454 eng and they have factory heads. 336781 are the numbers on the heads. I went to mortech for info, but now I need opinions on just how these heads perform. They seem to have been ported at some time, but in general terms, how well can I expect these heads to perform?
Thanks in advance,
Mark
Thanks in advance,
Mark
Thread Starter
Safety Car
Joined: Oct 2005
Posts: 3,570
Likes: 1
From: Algonac Michigan
Mark
Le Mans Master
Joined: Jun 2004
Posts: 6,231
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From: Seattle WA
St. Jude Donor '14
I don't see any problem at all with 500 HP from those heads with the right cam. As noted, for that power range and intended use (low-end torque vs. top-end HP) they're solid.
The only question is how much work they'll take to get in shape - you may want to compare a machine shop estimate for an overhaul to a set of aftermarket heads.
The only question is how much work they'll take to get in shape - you may want to compare a machine shop estimate for an overhaul to a set of aftermarket heads.
Thread Starter
Safety Car
Joined: Oct 2005
Posts: 3,570
Likes: 1
From: Algonac Michigan
They appear to have been massaged at some point in the past as far as port/polish. I have them at a reputable machinist right now to get a opinion on there true condition.
Mark
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From: Sierra Foothills CA
I saved the Jan. 03 issue of Car Craft because it has an article called "Eight Great Engine Combos". In it they refer to a 454 they built in 01 that made 542 HP & 552 TQ. Comp. ratio was 10.13:1, cam was Comp Cams XE274H, heads were Edelbrock Performer RPM 454-O Aluminum, intake was Edelbrock Victor Jr, carb was Speed Demon 750, and they used 2" headers.
Even with a bit less compression due to today's poor fuel, a good dual plane intake, and your iron heads (done properly they can flow very close to the Edelbrocks) you should meet your goal & then some. Good luck.
Thread Starter
Safety Car
Joined: Oct 2005
Posts: 3,570
Likes: 1
From: Algonac Michigan
I don't see any problem at all with 500 HP from those heads with the right cam. As noted, for that power range and intended use (low-end torque vs. top-end HP) they're solid.
The only question is how much work they'll take to get in shape - you may want to compare a machine shop estimate for an overhaul to a set of aftermarket heads.
The only question is how much work they'll take to get in shape - you may want to compare a machine shop estimate for an overhaul to a set of aftermarket heads.
Only question at this point that is unanswered is why there are multiple shims under each spring. I imagine they were put there to make all spring pressures equal. Sound about right??
Gasket matching has been done and I thought some porting had been done, but I was wrong.
Cam numbers are Z024 and E029...Can anyone I.D. this cam for me. It is wiped out due to poor break-in, but I am curious as to just what has been done to this motor. Lobe height is 1.458 and 1.598 if this means anything!
Any suggestions on a parts list to get this motor to 500 lbs of torque and around 500 hp at the rear wheels(manual 5 speed trans) would be appreciated. Trying to set a budget for this build.
I know that I will have to invest in a new intake,so I figure about $200.00 for that.
Anyone here think I can get by with a finely tuned Q-Jet??
I also found that it has Comp Cam rockers at 1.72.
Thanks,
Mark
