New to me 351W build idea?

[JeffBoudah]

Lighting blocks are roller blocks without tapped holes for the spider.

[gadget73]

Lighting motors in and of themselves really aren't that hot of a deal. Its 20 ponies more than the standard motor. Its got better heads, but instead of heads that were inadequate for a 302 and grossly so for a 351, they ran heads that were adequate for a 302 and still somewhat undersized for a 351. The intake is the closest thing to special about it and you can still do better. The cam is actually flat tappet for reasons unknown when all of the rest of the truck motors those years were roller cam.

If you really want to make truly good power, you're going to do a head/cam/intake swap to start with. Thats all the Lightning has over the standard truck motor, and they aren't parts made of supreme awesomeness so there is nothing really to gain by using one as a starting point. For us specifically, that intake fits under a stock hood.

Honestly there are very few factory motors from anyone, especially older type engines, that can't be improved a fair bit over factory configuration.

[turbo2256b]

If your building a 302 best heads are ported GT40s (done correctly) that came on Lightnings and several other vehicles. Building a 351W you need some aftermarket aluminum heads. Most all aluminum heads are really to big for a 302 unless you are wanting to turn some really high RPM. Ported GT40s with the correct parts will make power up to 7500 / 7800 RPM.

[JeffBoudah]

Ported gt40 heads maxed out will flow 250cfm on intake, there's no way, just no. An afr 165 flows more as cast.

[JeffBoudah]

Here's a good real wold head comparison, not theory.

http://airflowresearch.com/articles/ultimate/Group1/Part1/A-P1.htm

http://airflowresearch.com/articles/ultimate/Group1/Part2/A-P1.htm

[turbo2256b]

Ported gt40 heads maxed out will flow 250cfm on intake, there's no way, just no. An afr 165 flows more as cast.

There is a lot more to it than just bigger heads. They have to be sized to the engine and its usage. Most use some ARF heads on a 302then use a puny intake to compensate for it. Port volume , air flow and air speed have to be taken into account. Big heads on a small motor will be less effective in filling a cylinder to compensate RPM must be increased or size of engine.
I use to get a kick out of blowing away 87 ish Mustangs with aluminum heads 4.10 gears and stuff with my pocked ported DOOE heads ON MY 84 MUSTANG VrJr intake, 750 Holley, 5 SP AND 3.08 rear gears turning 12.1 quarter miles. With 4.10 gears it would have been in the low 11s.

If you were to think of a flow bench like an engine say I SET UP A PORTED gt40 head then remove the head and install a larger port head the depression of the bench has to be changed to bring the air flow back up this would be the same as increasing the RPMs or enlarging the motor .Using a bunch of calculations one could actually figure the increases of RPM or engine size needed

So a 302 migh actually pull 240 CFM with the GT40s but at the same RPM wit hto large of a head only pull 200.

[Bobcat]

351 roller blocks have a tendency to crack. You're better off with a pre-roller block and using link-bar lifters. Info here. http://forums.corral.net/forums/5-0-...lock-guys.html

No.. IF you're going to be nit-picky about years. You want a 69-70s block with link bar roller lifters, or a roller block. But for his specific build, roller motor is best. Unless you're pushing serious ponies.



Zach, I'd like to see that mounted up. Since I was also interested in the air dam with fog lights.

[JeffBoudah]

There is a lot more to it than just bigger heads. They have to be sized to the engine and its usage. Most use some ARF heads on a 302then use a puny intake to compensate for it. Port volume , air flow and air speed have to be taken into account. Big heads on a small motor will be less effective in filling a cylinder to compensate RPM must be increased or size of engine.
I use to get a kick out of blowing away 87 ish Mustangs with aluminum heads 4.10 gears and stuff with my pocked ported DOOE heads ON MY 84 MUSTANG VrJr intake, 750 Holley, 5 SP AND 3.08 rear gears turning 12.1 quarter miles. With 4.10 gears it would have been in the low 11s.

If you were to think of a flow bench like an engine say I SET UP A PORTED gt40 head then remove the head and install a larger port head the depression of the bench has to be changed to bring the air flow back up this would be the same as increasing the RPMs or enlarging the motor .Using a bunch of calculations one could actually figure the increases of RPM or engine size needed

So a 302 migh actually pull 240 CFM with the GT40s but at the same RPM wit hto large of a head only pull 200.

Dude, until you can produce some dyno sheet, photos, or data of any sort just keep your obnoxious bench racing to yourself.

[turbo2256b]

Think I smell another Pirate

[turbo2256b]

Zach, I'd like to see that mounted up. Since I was also interested in the air dam with fog lights.

Like to see that myself. Debated about it but for my purposes decided against it.

[JeffBoudah]

I certainly smell what you're shoveling...

[turbo2256b]

I think you need to stick a finger in your dike some might like to learn something beyond magazine articles that are most often based on who spends the most in their advertising section. Like installing a air dam. Sorry guys never realy finished the thread but got a bit side tracked on a lot of other automotive projects. Looks like several of you got the idea.

[killgore]

Like to see that myself. Debated about it but for my purposes decided against it.

Would've been cool to run air ducts from the dam up to ye ole engine

[sly]

Jeff and Turbo... throttle down or take it to the battlefield.

[JeffBoudah]

I think you need to stick a finger in your dike some might like to learn something beyond magazine articles that are most often based on who spends the most in their advertising section.

At least they support what they claim with data... try it sometime.