EX274 vs EX 4x4 270 - Hot Rod Forum : Hotrodders Bulletin Board
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Old 10-02-2004, 04:51 PM
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EX274 vs EX 4x4 270

Was just wonder'in about these two cam's for a posible cam choise for my 350 sbc, #1 is the part # 12-243-3 a EX 4x4 grind with an Adv dur. of (270 in- 278 ex) (226 in- 234 ex @50) (.480 in- .498 ex lift ) (111 L/S) and cam #2 is the EX274 with an Adv dur. of (274 in-286 ex) ( 230 in-236 ex @50) ( .487 in- .490 ex lift) (110 L/S) both at a 1800 to 6000 rpm range, and both require the same valve spring. I do have these spring's ready to install when the time come's. I know that i other post's i've stated that i had a Comp 268H High Energy cam for this project but since switched to a flat top piston to get the C/R down under 9.5 that i could benifit more from a EX Energy grind. Just bounce'in around idea's because one of Summit's tech guy's told me that the EX274 would be a good match for my S/R Torquer head's, and the Edelbrock EPS manifold, saginaw 3speed, 3.40 gear's, and .28in radias tire's.(Oppinion's Please)

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Old 10-02-2004, 07:01 PM
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Stick with the 268 you have or an XE 262. Both of those cams you're looking at are kinda big if the comp. ratio is under 9.5-1.
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