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What year did the bolt pattern change for the stock heads?

Are all Corvette TPI intakes compatible? I'm noticing my 86 intake will not bolt to the center pair of holes in my Trick Flow heads. The bolt holes are tapped in a more vertical direction rather than perpinicular to the head face. The end pairs at all four corners are correct. The only...

Based on those estimated values, I would have a DCR of 9.5 +/-. So I can assume I will be using high octane gas additive, or short of tearing down the engine, I could swap for a set of 64 cc heads to lower my DCR closer to 8.5

Is it possible to determine my static compression ratio based on the piston part number that was installed in the block? (FYI Summit part # H345NCP...@ .30 over...as refering to the piston specs). What I'm getting at is, just because I asked the engine builder for a specific cpr, did he in...

I don't know about retarding the cam 4 deg. at this point. The motor is already installed in the car w/ most accessories in place. But it seems the shop that built my short block that put this combo together should have been aware of an acceptable dynamic compression ratio and possibly...

In reference to the thread "Performance Help", I understand the principles between dynamic and static compression. And I assume when casually discussing compression ratios, we are discussing the static ratio. I guess what I'm unclear about is Grumpy's post reply that I may have a problem with...

Grumpy... That is very valuable information for anyone considering an engine rebuild and I will be saving for future use. I have a couple of questions for you though as I get ready to fire up my engine after the rebuild. You discussed detonation and A/F ratios. Since my block is now a 355...

I have the Baer Eradi Speed drilled & slotted rotors ($500 for a set of 4). Very happy w/ performance. I suggest if you go drilled & slotted to spend the extra money on a good set. Don't go cheap. You won't be happy and you'll either spend the extra money later on a good set or go back to...

Thanks, I did get some brass bushings for that reason. But I thought there might be a specific part # for a replacement. I've been looking through the Borg-Warner catalog for parts that will fit the 1/2" threaded hole. I've found a few that are special order parts. Thanks for the reply.

I've got a new set of Trick Flow (D-Port) heads for my '86 short block, but the fan switch sensor & temp. sending unit are different thread size than my stock pieces. I saw a set of Edelbrock's at the part store and it has the same threads as mine, but they don't know what part # it uses. Does...

I have to agree. It doesn't pay to use the cheap stuff. We had our O2 sensors replaced about 25,000 mi. ago. Don't know what brand the mechanic used, but the car just started acting up yesterday the same as it did before....using a ton of fuel and slugish...rough...blah, blah, blah! Now I...

What he said. I used the aftermarket metal case for mine and it works fine.

Thats great! Thanks, but I don't need a photo. Sounds like I have it in properly.

I'm trying to find information on how far the 1 piece rear seal goes into the seal housing. I found one thread that says it goes in until it bottoms or seats. Another photo I found on CAC shows it flush with the outer edge (flywheel side) of the retainer housing. I have it pressed in flush...

I do have a set that are off of my 86. Don't know if they are the same as yours. I just put a new egr pipe and sleeve on too. One catch, I'm in the middle of an engine rebuild and planning to install headers, but hanging on to the stock manifolds just in case funds run low. I'm sure you need...

I was reading in Lingenfelter's book about plugging the oil bi-pass valve on the oil filter adapter. Just wondering if anyone has done this to their motor. It makes sense to plug the bi-pass to keep unfiltered oil from re-entering the engine. Although, he warns about blowing oil filters apart...

Maybe its only bored .020 over for 377 cid.

I was going to get the Edelbrock heads for mine, but the tech at Summit racing said that sometimes there are clearance problems between the spark plug and headers. Because Edelbrock uses their own castings and the plug boring is in a slightly different location on their heads, I guess only some...