و احد من روائع شفرليت >>>> اشرايك في كلمه روائع هههههه
و هذا الفورتك الجبار
Testing engines is like running a marathon. There are some spots where you’re way behind and there are others where you’re pulling ahead. But, the race is almost never done.
The race to make more from less with normal pump-gas engines is becoming increasingly harder to run. A lot of the difficulties come from finding a set of cylinder heads that’ll make power but not break the bank. For ideas, we dove into our ever-enlarging pile of readers’ letters to find out which set of heads they’d most like to see bolted on next. The clear winner in the iron head category was GM’s Vortec, receiving more than 10 percent of the total votes. We know that the Vortec is a good head design, and it didn’t take us long to make our decision.
POWER RECAP
For this dyno test we thought we could do a little better by installing a set of Vortec cylinder heads and trying COMP Cams Magnum roller tip rocker arms. Our 355-cid small-block clocked in at 422 peak hp and 452 lb/ft of torque. Average horsepower and torque were at 339 and 426, respectively.
MOTOR SPECS:
GM four-bolt, 355-cid, 9.4:1 compression, GM Vortec iron heads (SDPC PN SD8060A, 64cc chambers, 170cc intake runner volume, 1.94/1.50 valves), COMP Cams 1.6:1 Magnum roller tip rockers (PN 1418-16), Edelbrock RPM Air Gap Vortec intake manifold (PN 7516), Speed Demon 750 carb, 1-inch open carb spacer, COMP Cams XE262H cam (262/270 adv duration, 218/224 duration at .050, .462/.469 valve lift, 110 lobe separation) straight up, 1 /34-inch Hooker headers, 91-octane Shell Unleaded fuel
محرك باضافات و توسيعات صغيره راح تشوف النتائج الطيبه
اشرايكم فيه
ويلله باااااااااااااااي .
