i am in the process of hopping up my 68 ranger it has a 240 that i has had a fresh rebuilt but it blowed the head gasket so i am going to pu an offenhauser 4 barrel in take and a isky racing cam in it what else should i plan on doing to the motor or what problems will i incounter with this set up? i have already installed a set of headman headers and dual exhaust and the motor has been bored 30 over any help would be apreciated the intake i plan on useing is offenhausers dual port with the recomended holly 390 cfm carb this is the cam i am looking at getting .
Grind No./Type
280 HYDRAULIC High perf. Use. Lopey idle. 2500 stall. 3.70-4.11 axle ratio. Up to 750 CFM Carb. 9.5
1 compr. RPM-Range
2500-6500 Valve Lift - INT
.465 EXT
.465 Valve Lash Hot - INT
.000 EXT
.000 ADV Duration - INT
280° EXT
280° .050 Duration - INT
224° EXT
224° Lobe Center
109°

 

Without a decent port job on your head you won't see the full benefit of that cam, intake or header.

 

This is a very strong cam for a streed machine. You will need high compression for sure. Make sure you have a good valve train, springs, keepers etc. With this lift you need at least 1.84 on the intake valves and maybe 1.94 intake and 1.60 on the exhaust valves. You might even want to go with some Rhodes lifters. They help on bottom and top end of the rpm range.

 

The first hop up I would do on a 240 would be a 300 crank and pistons.

 

what is the diffirecie between the 240 and 300 cranks i had my crank turned 10/10

 

The only difference is the stroke. Dollar for dollar you won't find a better way to increase performance than to add 25% more displacement with readily available stock parts.

 

longer or shorter the motor has been bored 30 over also i dont really want to rebuild the whole motor again i any have around 8,000 miles and a grand in this rebuild i took a short cut and it bit me in the butt when i had the head worked they did not build it complete just replaced what was worn or bad in the head only every thing else in the motor is new down to the dip stick just tried to save a few bucks and now im going to spend more than i would if i had of just done it rite to start with

 

All "go" parts for the 300 will also work on the 240 .
( intake, headers) The 240 is a good engine I have one and I like it - it seems to rev up quicker and pulls to 4000 rather then 3500 due to its shorter stroke.
The older car type 240's have a better compression ratio I think it is like 9.2 to 1 where as the truck is 8.2 and I have seen rplacment pistons that give as low as 7.2 to 1 !!!.
It is all in the gearing the 1974 truck that I have has the 240,c4 auto, and 3.70 to 1 gears .

 

Chas1234, you said "car type 240's" was the 240 ever put in a car?

 

ford put them into the full size galaxie .
i have not been able to find the older style pistons but then again I havent looked that hard .
deck the block and that should help with the compression.