So is the 70 W30 455 a round port engine and if so you should put it next to a 455 Super duty at over 10:1 compression. Otherwise the W30 has the compression advantage over the SD or HO engine due to the drop in 1971. No round port Pontiac 455 in 1970 and there was is 71 but at a lower compression. here is some stock times to mull over:
1970 (W-30) 455/370: 0-60 in 5.7 sec, 1/4 mile in 14.2 sec @ 100mph 442
1970 400/366 Ram Air III: 0-60 in 6.0 sec, 1/4 mile in 14.7 sec @ 98mph.GTO
1971 455/335 (HO): 0-60 in 5.9 sec, 1/4 mile in 13.9 sec @ 103 mph. firebird
1970 400/370 (RA IV): 0-60 in 5.6 sec, 1/4 mile in 13.9 sec @ 102 mph. firebird
It has only 2 MPH over the little 400 in a GTO and is slower than the lower compression 71 455 HO. The 70 400 in the F body would be the same or very similar performance. I bet a 1970 455 D port would do just fine against the Old's 455 but the olds guy's are weird about their W30. My wife's uncle told me he had a 70 W30 that was almost 600 horse on regular pump gas and would do 11 seconds flat without a posi....man it was hard to keep a straight face. Especially when he told me he had his buddy time it on his wrist watch and guessed how long a 1/4 mile was...lol
|