Re: Hot Rod Magazine 289/302's/327/350's and 351's dyno test?
A few observations, if I may:
HP is all about FLOW. Since it's the time rate of doing work, and "doing work" is just another way of saying "releasing energy", then it's obvious that HP is determined entirely by how much the induction system flows, if all else is equal. Which, if you follow that to its logical conclusion, means that if you took an induction system and put it on 2 different motors that were absolutely identical in all respects except for their CID, you should get the same HP, except at different RPMs; and, you should get peak torque in direct proportion to CID, except again at different RPMs. Look at the 302 vs 327 #s.... identical heads, cam, compression, exhaust, intake, only thing different is the CID. Look at the HP and torque numbers; do the arithmetic of 327/302 * the 302's torque, and look how close that comes to the 327's torque. They follow the above description to the point that it's scary. Same for the Boss 302 vs Boss 351. Not quite as close, but not too far off either.
The Cleveland 4-bbl heads are AWESOME. IMO some of the best V8 heads ever made. The exh port is HUUUUGGGEEEE; it's so big, a stock cast-iron BBC exh manifold will almost GO UP INTO it (OUTER DIMS of BBC exh man casting only very slightly larger than the Cleveland PORT). It's a real shame they put the stupid Cruise-O-Matic BH pattern on that block, so you can't bolt a C-6 to it; and that it has that stupid Frod valve train on it. That was onehelluva motor, otherwise. Oh... and of course, that it was a 351, in the days when the cut-off between "high performance" and "regular", for insurance purposes, was at 350. That was about a 35% hit to the premium, for that ONE inch. Thank you Frod.
Kind of amusing how the Boss 302, with Cleveland heads, put out 25% more HP than the 289, with Windsor heads. Really shows how much of an engine's performance lives in the HEADS.
Looks like in "stock" trim, the 487 head casting flows more than the 186.