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Without writing all the flow figures down i will throw in a guess that between 500 and 700 lift with the ported LD340 it will range between 263cfm and 285cfm and within 5cfm of the head flow from 100 to 450.

Some of the aftermarket cast 318 pistons are far enough down the bore or that close to it that you could run a 360 (3.58) stroke crank with them and be at zero deck and 349 cubes at 30 thou over. I know someone who did this before stroker cranks became popular. If you have a 360 crank already...

Rough durations specs on the cam Brian? I'm just curious what it took to achieve the 500hp mark with the trickflows.

Hi everyone. I have two 69 Barracudas, one factory manual steering car one factory power steer car. Is there any difference in the two steering columns besides the length of the inner shaft that joins to the box? Could I just swap the shafts between the cars and leave the rest of the original...

I sonic tested a few and the best I had was a 76 casting, thicker than an early block I had. I also tested several 318 blocks and they were also worse than the thinnest 360 I had tested.

Back in the mid 90s i bought this 1966 VC Valiant, it had a 340 engine fitted but wasnt running as it was an early a body and needed work on the oil lines and exhaust given the narrow engine bay. In Australia the biggest engine option in this model was a 273. When i got it running i fitted a...

What point do you think it will become an issue with decent rotating parts or are you concerned about the oiling system?

Thanks for that, the engine seems to run very well with the stock victor 340 inlet, hoping that some porting will give it a bit extra again.

I saw the numbers on the ported victor 340 on the ported speedmaster heads, was just wondering if you flowed the stock victor 340 stock on the same heads. I might have missed that amongst the other posts.

Sorry for the multiple questions , is there a lot of potential available in porting the victor 340 inlet? A friend is running a stock one on a 408 stroker running ported cast heads and im curious if you think porting it will be worth the effort.

How do you think the ported speedmaster would compare with an as cast performer rpm inlet?

I think if i was to attempt this i would look at a pair of the later closed chamber W2 heads with the high 40ish cc chambers to get some compression into a stock stroke 318 with a flat top piston. Mildly ported heads with a 2.02 valve so they arent too big and a solid roller.

My 69 Barracuda fastback runs consistent 11.7s at around 115 to 116 mph. Mild 408 W2 ,10.5:1 comp engine with 3000rpm converter and 3.91 gears. Car is all steel and weighs 3300LBS without me in it. Would i like it to be faster, yes, but it is such a great street car that has been going strong...

What sort of duration is the flat tappet cam on the inlet / exhaust if you dont mind me asking?

Ok, was just going to mention that a friends 493 had a big rear main leak. They discovered that the arp studs interfered with the main seal carrier just slightly and they had to do some clearancing to get it to sit flush. No more rear main leak after that.

Do you have arp main studs?

First gear is going to take you to just over 60mph with those tyres at 4500rpm and with the weight and gearing of the truck currently im not sure how much faster than that it will go over the quarter? If you cant find a really cheap diff centre for it i would be putting the smallest 15 inch...

What range of diff gears did these trucks come out with originally? 2.71 with a 31 inch tyre you arent even going to see much of second gear over the quarter mile!

Thats around where i was thinking, will give it a try.

Just an update, comverted the metering blocks on the old 750hp to adjustable power valve channel restrictors and adjustable idle feed restrictors. Dropped the ifr size from 35 thou to 31 thou and it now cruises on the transition slots at 12.8 to 12.9. Increased the pvcr size from 61 thou to...

No problem yellow rose, i havent had much chance to get out to do any more tuning since the weekend. Havent read much about limiting the t slot circuit but that would make sense as i think that is where it is running the richest before it comes on the primary jets. Is this a better method than...

Carb is later than a 4779, its a 750hp with adj air bleeds. I had a 4779 on it originally. The hole originally was at low to mid speed crusing and give it a quick stab on throttle, seems much better with the 10.5" pv over the 6.5". Wide open throttle was always good with the 74/82 jets and...

Carb is 750hp with four corner idle and adj air bleeds. I will double check the transition slots they were set years ago but may have changed fiddling with idle speed.

Power valve is new and idle mixture screws are sensitive to minor adjustments so i think its fine

Just been doing some experimenting with the 750 HP Holley double on my 408 small block 69 Barracuda after reading the power valve thread. Fitted an afr gauge to check the cruise afr's. Original setup after dyno was 74/82 jets, 6.5 power valve. Seemed to cruise rich and had a hole in the middle...

Some rough maths with a 28" tall tyre and 5.13 gears would give you 6160rpm at 100mph over the eighth mile with no converter slip at all. If you estimated say 5 percent slip it would be just under 6500. If you are aiming for more mph it could be up to 7000rpm so i think 5.13 would be good over...

Heads : With the low compression pistons in your engine i think you are going to need a very well ported / good flowing set of 360 cast heads or the promaxx alloys (also well ported) so you dont need to big a cam which wont like the low comp and then have to run a very low set of gears. My...

What size valve and what size stem were you running in them?

I wish someone would make a small block mopar head in aluminium that looked like a cast one so they dont stand out in the engine bay. They could also sell them with the pushrod holes undrilled or multi drilled for use with either std location rockers or offset rockers and so they could be opened...

If that part number is for an eagle cast crankshaft i hope they are better than their cast stroker crankshafts. I have seen several of those in two pieces on engines that werent big horsepower combos. I would use a factory cast crankshaft over a cast eagle crank any day.