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i think I'm going to go with these headers, modify a walker y-pipe with 2.5” outlet i already have and use a 99-03 7.3 3.5” diesel tailpipe i already have.
She wants it to sound good, as tempting as it is to use manifolds.. https://www.summitracing.com/parts/SNH-FC3-P
i really liked the 255deh comp cams grind for these that appears they stopped making, cost me more to have cam re-ground to those specs, so probably wont do that. 203/216 @.050 .465/.495 110 lobe sep
i think I'm going to go with these headers, modify a walker y-pipe with 2.5” outlet i already have and use a 99-03 7.3 3.5” diesel tailpipe i already have.
She wants it to sound good, as tempting as it is to use manifolds.. https://www.summitracing.com/parts/SNH-FC3-P
I like these a lot.
And I thought the right side was a choker for sure. The left side not as bad.
i really liked the 255deh comp cams grind for these that appears they stopped making, cost me more to have cam re-ground to those specs, so probably wont do that. 203/216 @.050 .465/.495 110 lobe sep
Looks like a good choice.
I ran a factory 1971 351 CJ cam in my Torino, probably not the best cam for a truck.
And Sig Erson anti-pump up racing lifters.
Been on mind since seeing pics, and you mentioning how deep in the block pistons were at TDC, and then seeing the picture with the tape measure at 4" ..... have you actually measured how far a piston travels from dead bottom to dead top. The 400 in my basement, the pistons are closer to top at TDC than I saw in your pics, and considering other issues you found, wondered if maybe you have a short crank in there somewhere? 400 pistons have same OD as 351M pistons, fit in the same block, but 351M pistons have more above the wrist pin because the 351M crank has a shorter 3-1/2" stroke. I had not seen one sent out without a rear camshaft hole plug either.
A bit of a side comment, but I also watched a few of those engine masters to help with exhaust selection.
I ended up going dual 3” back to a 2 into 1 turbo muffler behind the (super)cab, with single 3” the rest of the way. Good flow and sounds great, although I also have a bottle resonator at the end, with a Helmholtz resonator at the 90* over the axle that knocked down most of the low rpm drone.
I modified (basically cut it all apart and started almost from scratch) a 76 FE full length header set to fit my 78.
If I had to do it again, I would’ve done mid length headers to save 40+ hours of fab, but stuck with 3” the whole way. I do wonder if 2-1/2” duals would help keep the exhaust velocity more consistent for better low end scavenging?
Downside, they’ll make a less than wise man think that a guy can get a complicated job finished in a couple hours with parts that “were just laying around”. Fun to watch and good for reference. Not so much for real world, working by yourself execution.
